rk3568 android11 AP6275s调试

一、AP6275S的32.768k波形要求：

1、+-25ppm，计算的范围是：32767.1808~32768.8192Hz

2、占空比：30%~70%

3、峰峰值：1.8v+-0.09v

4、上升沿：目前建议上升沿时间小于200ns

5、不要有overshoot and ringing

二、以下是标准的波形：

三、如果波形有以下现象，不符合要求，需要调整

1、三角波，上升沿和下降沿时间不符合要求

2、有overshoot and ringing

四、SDK源代码修改：

1、kernel部分需要更新正基最新驱动：bcmdhd.100.10.545.x-20210305.7z

2、kernel dts配置修改

diff --git a/arch/arm64/boot/dts/rockchip/rk3568-evb.dtsi b/arch/arm64/boot/dts/rockchip/rk3568-evb.dtsi
old mode 100644
new mode 100755
index ea2eff5..c48ea26
--- a/arch/arm64/boot/dts/rockchip/rk3568-evb.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3568-evb.dtsi
@@ -309,7 +309,7 @@
 	wireless_wlan: wireless-wlan {
 		compatible = "wlan-platdata";
 		rockchip,grf = <&grf>;
-		wifi_chip_type = "ap6398s";
+		wifi_chip_type = "ap6275s";
 		status = "okay";
 	};